Potential and electricity savings from solar water heaters

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Solar water heater

• A solar water heater uses energy from the sun to heat water. So that mainly it will reduce our electricity bills. A solar water

heater works on two basic principles.

• one is when water gets hot it rises due to density differences between hot and cold water (thermo siphon effect).

• Secondly that black objects absorb heat.

• solar water heater comprises three main parts: the collector, the storage tank and an energy transfer fluid.

• Solar water heater is classified as r active or passive and direct or indirect systems.

• They may make use of either flat plate collectors or evacuated tubes.

Reduces water heating costs

• Water heating costs for a mid-high income household can be reduced by some 60% with a SWH.

• This saves your monthly electricity bills.

• Improved quality of life and a reduction in electricity costs can be achieved by using solar water heater in your home.

Active and passive

• The active system uses a pump to circulate the fluid/water between the collector and the storage tank.

• Passive system uses natural convection (thermo siphon) to circulate the fluid/water between the collector and the storage tank.

Direct vs. indirect (open-circuit)

• Direct collector heats the water directly and the water then circulates between the collector and the storage tank.

• A direct system can only be used in areas which are frost and lime free, without treated or borehole water.

• The solar water is stored in the storage tank, and is heated by a heat transfer fluid. • This is heated in the collector and flows around a jacket which surrounds the tank and thereby heats the water.

• An indirect system can be used in all conditions.

Flat-plate vs. evacuated tube

• The main components of a flat plate collector are a transparent front cover, collector housing, and an absorber.

• This technology has been used for over fifty years by manufacturers and has a well established track record of reliability performance.

Evacuated-tube collectors• This comprises a closed glass tube, inside which is a metal

absorber sheet with a heat pipe in the middle, containing the heat transfer fluid.

• Evacuated tubes are a newer technology manufactured efficiently all over the world.

• Generally evacuated tubes have exceptional performance but have not yet had time to establish a track record of reliability.

Close coupled system

• This is the most energy efficient and most commonly used installation.

• It consists of a roof-mounted solar collector, combined with a horizontally-mounted storage tank which is located immediately above the collector.

Split coupled systems

• These refer to systems where the water storage tank is situated usually within the roof.

• Where the tank can be installed above the collectors a passive systems can be used (using thermosyphon to circulate water), where not, a pump (active system) would need to be installed to circulate water through the collectors.

Commercial and industrial use of SWHs

• Solar water heaters can be used effectively in several commercial solar water heater applications (e.g. hotels), as well as in hospitals, clinics and old age homes.

• Although the hot water demands here may be higher than residential, the increased roof area of these buildings allows for more collectors to be installed.

• Efficiency figures comparable to those of the residential sector can be achieved.

• It is a potentially very effective mechanism to drive implementation and stimulate the solar water heaters industry.

• This mechanism is attractive because the hot water user (house/ hospital etc) bears no capital costs and doesn’t worry about the maintenance of the system.

• It also reduce electricity bills in your home and it is relatively hassle free.

• This provides a useful mechanism for cities to consider implementing within their own facilities (council housing schemes, public facilities, large buildings, etc)

• Fee-for-service mechanisms are being used within large institutions, such as flats and retirement homes.

• Glazer India one of the leading manufacturers of solar water heaters in India. Choose the ideal solar water heaters as per your domestic, commercial and industrial needs. Visit http://www.glazerindia.com/ for more details.

Contact us

GLAZER SOLAR ENERGY PVT LTD, 3 /1, Assisi Nagar, Near Assisi Church, Athipalayam Pirivu, Ganapathy, Coimbatore - 641 006.

Email id:sales@glazerindia.com phone no:8220049970, 8220049971, 8220049972, 8220049974, 8220049976

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